I’m on a constant search for the next new core exercise—the twist or tweak that will render the standard few abdominal exercises (plank, sit up, crunch) nearly un-doable, and therefore super-valuable to any athletic endeavor or yoga practice. Yoga teacher Justin Michael Williams delivers a dozen or more such movements in one 17-minute video.

From twists on the classic boat pose to a forearm plank variation that will eat your obliques and shoulders alive, this sequence offers enough movement and variety to keep things interesting, and enough breaks and modifications to make it do-able for beginners (or for people who reeeally don’t feel like doing core work today). I’m going to be honest and admit that the first time Williams suggested I take a rest in sphinx pose, I laughed out loud, then laid flat on my stomach in exhaustion.

Yogis will love the way the sequence fuses movement with breath, and the way it boosts their inversions and arm balances—I have been doing the sequence regularly for about a month, and I genuinely think it’s helped my handstand practice. Athletes will love that their midsections will be sore for days after their first attempt at the workout.

Let me know if you try this—and if you make it to “rest” in sphinx pose!

Perfect timing, I was on my way home to do some core work when I saw this. Yowza!!! That was crazy. I was DEFINITELY grateful for that Sphinx pose. Whew. Thanks for sharing. (I may not say that tomorrow)